The animals in experiments could experience severe pain and suffering. Hence, wild animals are avoided, and those grown in the labs are used.

The requirement to be followed in the process of animals experiments include

1. Well designed and clean animal house.

2. Suitable temperature, ventilation, humidity.

3. Unlimited access to food and water.

4. A Vet for a regular checkup of animal health.

5. Technical personnel for maintenance of animals house.

Why are animals used for testing:

They are mostly used to safeguard humans from direct exposure of substances used by immediate internal consumption or external applications on the skin. The use of animals in experimentation helps to

Study anatomy and physiology: Here animals like frogs, rabbits and even rats are taken for studying physiological systems like circulation, digestion, excretion etc.

Besides lower animals like earth worms, molluscs, cockroaches are used to study their internal organisation and function.

Evaluate toxicity: Animals are used for testing the harmful or poisonous effects of drugs, food supplements, etc. if any. If the substances fail to pass their test in animals due to severe adverse effects or toxicity, then they are not tried for human use.

Fixing the dose or quantity: Every drug, food nutrient, vitamins, supplements we take are recommended at fixed quantities or doses. These doses are in the safe range for consumption and also produce the desired effect on the body. Thus tests on animals help in fixing the correct dose or quantity of drugs or supplements to be in safe and effective range.

To study the drug action: Animals have body function and physiology similar to humans and hence, they act to mimic human response and behavior to substances. The mechanism of muscle contraction, heartbeat, circulation is easily understood by a study on animals. Further how a drug acts in the body like by either rise in heartbeat, circulation or respiration rate can be understood by scientific testing on animals.

To know the time spent in the body: Animals studies of any substance helps in understanding the time spent by the substance in the body before its elimination by excretion. The more the time spent, the more the chances of poisoning, accumulation, adverse effects and the duration of its effects on the body. By conducting blood and urine tests on animals after administration of the test substance, it is possible to know the extent of time spent by the substance in the body.

In the production of biochemical products: Animals are also used to produce some substances which can be helpful to humans Ex. Vaccines, monoclonal antibodies, antigens, etc. They serve as the reservoirs to produce these substances in their body. Hence animal tests are done to see the suitability of an animal for the production of any substance by modulation of its physiology or immunity etc. Ex: antibody production in rabbits

In drug research: In drug research animals are especially used to see how drugs produce their action in the body, i.e., by what mechanism. They also help in understanding how the drug is absorbed, the best route to administer the drug, how drugs are detoxified in the body and their main route of excretion.

Further, they are used to see the efficacy of the drug in a disease. Animals are induced with a disease similar to humans, and then drug s are administered to see if they are effective in the disease treatment.

Animals like fruits fly can be used without approvals from animal ethical committees as they are not governed by animal laws in most countries. But remaining vertebrate animals are experimented upon only after having proper approvals.

The animals collected for experimentation should housed in a well designed and maintained rooms. They have be given sufficient water and food through out their stay.

So animals are used in research mostly as pre-trial before trying on humans. Even a dog named Laika was trained and sent to space trip to see if the animal could survive there. Once the impact of space on the dog was studied, then humans went to space trips.